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Northern Prairie Wildlife Research Center

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Aquatic and Wetland Vascular Plants of the Northern Great Plains

57. Najadaceae, the Naiad Family

1. Najas L. -- Naiad

1. Najas flexilis (Willd.) Rostk. & Schmidt

Plants monoecious; stems branching, 5-30 cm long. Leaves densely clustered at stem tips, linear, attenuate, minutely spinulose on the margins, 1-3 cm long, 0.3-0.7 mm wide. Achenes olive-green to reddish, the beak 1 mm or more long. Seeds 2.5-3 mm long, 1/3 as thick, the seed coat shiny, very faintly reticulate, with 30-40 rows of obscure pits across the middle. Jul--Sep. Fresh or calcareous water of lakes and ponds; uncommon and local at scattered locations, mainly in the e and c parts; (Newf. and Que. to se Man., s to MD, IN, IA and NE; also B.C. and n Alta., s to ID and CA).
GIF- Distribution Map

Map key

Return to Family -- Najadaceae - The Naiad Family
Next Section -- Najas guadalupensis (Spreng.) Magnus. -- Southern naiad

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